Typewriting machine



July 15 1924. 1,501,671

A. G. F. KUROWSKI TYPEWRITING MACHINE Filed June 23. 1921 2 Sheets-Sheet 2 v Patented July 15, 1924.

UNITED STATES PATENT OFFICE.

ALFRED G. I. KUROVJSKI. OF BROOKLYN, NEVI YORK, ASSIGNOR TO UNDER-WOOD TYPE- VTRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYIEVJRITING MACHINE.

Application filed June 23, 1921.

T 0 all to]: am it may concern Be it known that I, ALFRED G. F. KUROw- SKI, a citizen of the United States, residing in Brooklyn Borough, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

This invention relates to typewriting niachines and is in the nature of an improvement on my co-pending application, Serial No. 453,616, filed March 19, 1921, being especially adapted for rapidly inserting envelopes or work-sheets, to bring predetermined portions thereof to the writing line at a single operation.

The main object of the invention is to provide simple and effective platen-rotating means, easy and economical to manufacture, readily assembled and taken apart, easily attached to machines of standard manufacture, and adapted for adjustment within a wide range for line-space movements of different extents.

In carrying out the invention, the improved platen-rotating device or attachment may include a bracket on which the other parts are supported, so that, by fastening the bracket to the platen-frame, the device will be in position for operation. A driving connection between the adjacent end of the platen-axle and a rotatable part of the attachment, coaxial therewith, may then be effected.

A finger-wheel corresponding to the one ordinarily in use on the end of the platen axle, with which the attachment is connected, may be secured to the rotatable part referred to above, so that, when the attachment is placed in position, the finger-wheel will be coaxial with the platen-axle and connected therewith for turning the platen.

The elements of the attachment may be so arranged that certain rotatable members, when rotatably supported in the device, will be held in position by other rotatable members, thereby avoiding separate fastening means for each of said members, and facili tating the assembling and taking down of the device.

An operating handle for the attachment and a stop-arm or gage for limiting the movement the handle in one direction Serial No. 479,734.

may be mounted on a stud projecting from the body of the attachment, and secured thereon by a nut threaded on the. end of said stud, the nut being locked in position by a screw threaded into the end of the stud, so that its head engages the end of the ,nut.

The stop-member, by which the movement in one direction of the operating handle is limited, may be adjustably held in different positions by a spring-pressed member thereon which may engage teeth of a fixed series to enable setting of the stop-member in positions corresponding to different linespace movements of the platen.

To facilitate the adjustment of the stopmember, provision may be made of a pointer, attached thereto, and of a line-space scale with which the pointer co-operates. Due to the multiplying connection between the operating handle and the platen, the distance between two successive graduations on the scale is small. To avoid undue crowding of the graduations and numerals, the scale is divided longitudinally by a medial line, along which the pointer passes, and the graduations are placed alternately on opposite sides of said medial line, and the numeral corresponding to each graduation is placed opposite-the same on the other side of the medial line.

For convenience in assembling the parts, a returning spring for the operating handle may be mounted in a container, the hub of which fits over the stud on which the handle is rotatably mounted and is held against rotation by any suitable means, such as flats, on the stud co-operating with corresponding surfaces of the hub. It will be evident that this feature greatly facilitates the assembling and taking down of the device.

It will be evident that, due to the manner of assembling the device, parts may readily be replaced.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a plan view, showing my invention applied to the platen-frame of an Underwood standard typewriter.

Figure 2 is a front elevation, partly in section, of the platen-rotating attachment,

1 spring device by which the operating handle is returned to normal position.

Figure 6 is similar to Figure 3, but with the handle at the end of its operating stroke. I

Figure 7 is fragmentary side view, showing a worksheet in position to be inserted, and the adjustable stop positioned to determine the proper extent ot' the operating movement of the handle.

Figure 8 is a view similar to Figure but showing the work-sheet advanced to a predetermined position for writing the first line, and with the operating handle checked at the end of its forward stroke.

Figure 9 is a view similar to Figure 8, but shows the handle returned to normal position.

A, rotatable platen 1 is carried by an axle 2 journaled in the ends 3 and i of the platenframe, said ends being joined by a rear paper-table 5 in the usual manner. In the ordinary operation ot the mechanism, a work-sheet is fed around the paper-table 5 to the rear feed-rolls G and then advanced by rotation of the platen between the latter and the teed-rolls 6 and 7. Actuation oi the platen may be ettected by a finger-wheel S fixed on the left-hand end of the platen-axle, or by a line-space mechanism comprising a lever 9 and a slide 10 having a pawl 11 thereon to engage and actuate a ratchet- Wheel 12 fixed on the plateiraxle 2.

In carrying out the present invention, pro vision may be made of special line-space mechanism carried by a single bracket 13, which may be secured to the platen-frame by means of a flange 14 extending inwardly therefrom over the top of the end t, and secured thereto by suitable means, such as screws 15 passing through elongated slots 16 in the bracket, the term of the slots permitting adjustment of the position ot the bracket. The operative connection between the attachment and the platen-axle may be eiiected by means of a sleeve 17 journaled in bracket 13 at such a point that, when the bracket is placed in position. on the adjacent end of the platen-frame, the right-hand end of the platen-axle from which the usual finger-wheel has been removed will enter the sleeve, a driving connection between the platen-axle 2 and the sleeve 17 being effected by any suitable means, such as a set-screw 18. Inserted in the other end of the sleeve 17 is a stub-shaft 19 journaled in a plate which is spaced from the bracket 13 by means of tubular spacers 21, and secured to the bracket by means of screws 22 extending through the spacers and threaded into the bracket. A finger-wheel 23, which may be the linger-wheel usually positioned on the right-hand end of the platen-axle 2, may be placed on the portion of the stub-shaft projecting outside of the plate 20, and may be secured thereto by any suitable means, such as a set-screw 2 1.

The bracket 13 may also be provided with a circular opening and with a collar or sleeve on its outer face in register with said opening, the sleeve being secured to the bracket in any suitable manner as by brazing. In assembling the attachment, a stud 27 is inserted in the sleeve and circular opening and secured in position by suitable means such as a set-screw projecting into a groove 29 in the stud. If desired, another 1 set-screw 30 may be used to secure the stud more firmly in position. The sleeve 17 may then be inserted in the opening 31. For purposes to be described hereinafter, the sleeve 17 may be provided with an involute gear 32 and a pinion formed at the outer end of the sleeve by means of a toothed annulus 33 on the outer end of the sleeve and fixed thereon by suitable means, such as rivets 3%, connect ing the annulus to the gear 32. A gear 35, with an inwardly-extending hub 36, is then placed on the stud 27 with the inner end of the hub in engagement with the outer end of the sleeve 26 and with the gear 35 in mesh with the pinion. or toothed annulus 33. Mounted loosely on the hub 36, for a purpose to be described hereinafter, is an arm 37. A ratchet-wheel 38, in the form of a toothed annulus may be secured to the gear 35 by any suitable means, such as screws 39, the annulus 38 projecting beyond the periphery of the gear so as to engage the outer face of the toothed annulus or gear 83.

The outer end of the stud 27 is shaped so as to form a reduced portion 4E0 separated from the stud proper by a shoulder ll, which lies just outside of the gear 35, and the reduced portion is provided with flats l2, so that, when a spring container 43, having a suitable opening in its hub ad, is placed thereon, it will be held against rotation. The spring container comprises, in addition to the hub at, disks and is provided with spring 46, included between said disks and secured at its inner end to a pin i7 fixed in the disks. The spring 46 may be tormed with a loop 8 at its outer end to receive the inner end of a pin 49 projecting from an operating arm or handle 50 loosely mounted on the reduced portion of the stud 27, spring 46 normally urging the arm to the rear. The plate 20 may then be placed over the stub-shaft 19 and secured in position on the bracket 13 by the screws 22. It will be seen that the plate 20 engages the outer surface of the ratchet-wheel or toothed annulus 38 and thereby holds the gear 35 on the stud 27, and that the plate 20 is provided with a circular opening 5i into which the container 43 extends.

A plate 52, which may be in the form of a gear, is then placed over the reduced portion 40 of the stud 27 and secured to the plate 20 by suitable means, such as screws 53. The plate rests against the outer face of the spring container 4-8, and is provided with a slot 55, through which the pin 49 on the operating arm 50 projects. An arm 55, the use of which will be described hereinafter, is loosely mounted on the reduced portion of stud 27 outside of the arm 50, and said arms are held on the stud by means of a nut 56 threaded on the outer end of the reduced portion 4:0 01": the stud and maintained in position by means of a screw 57 threaded into the end of said reduced portion.

In order to actuate the ratchet 38 by means 01 the arm 50, provision is made of a pawl 58 having a hub 59 which serves to space the pawl from the arm 50 so as to lie in the plane of the I'atcliet\vl1eel 38, and the hub is pivotallymounted on the arm 50 by means of a pin (50 fixed to the hub and extending through an opening 61 in the arm 50, the pawl being normally urged to effective position by means of spring 62 wound about the hub 60 and having one end secured to a pin on the arm 50 and the other to a pin 6i lined in the hub 59 and projecting through a suitable slot in the arm 50. Mounted on the outer end of the pin 60 is a finger 65 having a cup-shaped hub 66 facing inwardly and fitting on the reduced end 66 of the pin 60, said hub being held against a shoulder 67 of the pin 60 by means of a screw 8 threaded into the end of the latter.

When the arm 50 is swung to the rear by the spring 46. a rejection 69 on the finger 65 enters a depression 70 in the arm 55, which serves as a stop for the arm 50, and then rides out of the same, as shown in Fig ure 3, thereby throwing pawl 58 away from the ratchet-wheel 88, the rearward limiting position of the arm 50 being determined by the hub 66 striking against a lug '71 project ing laterally from the arm 55. Preferably provision is made of adjustable means to hold the stop arm 55 in different positions, so as to vary the number of line-spaces through which the platen may be moved by a single operation of the operating arm 50. To this end, provision is made of a member 72 mounted on the arm 55 by means of a pivot T8, and normally held in the position shown in Figures 3 and 7 by means of a spring: T linterposed between the lug 71 on the arm 55 and a lug 75 on the member 72, the movement of the member 72 under the action of the spring being limited by a stop pin '76 projecting from the arm 55. The member 7 2 is provided with teeth 77 adapted to co-operate with teeth 78 on the plate or gear 52, suitable finger-pieces 79 and 80 being provided on the arm 55 and member 72, respectively, so that, by pressing the same together, the rm 55 may be released and shifted to any desired position where it will again be held in position. by the member 72 when the finger-pieces 79 and 80 are released.

Upon advancement of the arm 50 by means of a handle 81 at the end thereof, the finger 65 is released from control by arm 55, and the pawl 58 moves into engagement with the ratchet-wheel 38 and advances the latter as the arm 50 moves from the Figure 7 to the Figure 8 position. As the arm 50 nears its forward limit of movement, pin 82 on the pawl 58 enters a notch 83 in the arm 37 and presses a tooth 84 on said arm into engagement with the involute gear 82, as shown in Figures 6 and 8, to prevent over throw. It will be seen that the arm 37 and the gear 32 serve, respectively, as an overthrow pawl and an overthrow gear. Normally the arm 37 is maintained in raised position by a spring 84; attached atone end to a fixed pin 84: and at the'other end to a pin 84 fixed in said arm 37. At the same time the pawl 58 is pressed against the ratchetwheel 38, and the end of the pawl 58 engages the stub-shaft 19, thereby checking the arm 50 in its forward movement.

The teeth 7 8 on the plate or gear 52 are spaced to correspond to line-space movements of the platen, and, to assist in positioning arm 55, so as to give a desired amount of line-space movement to the platen, provision is made of a suitable graduated scale 85 and a pointer 86 fixed on the lug 71 on the arm 55 by means of a screw 87. The graduations may be placed on a strip of any suitable material, such as celluloid, and this strip may be mounted on acircular flange 88, formed at the edge of a plate 89, which may be secured to the bracket 13 in any desired manner. Preferably, such fastening is effected by providing slots in plate 89, so that the plate may be slid into position over screws 91, threaded into the bracket at suitable points, and the screws then tightened to hold the plate in position. The ends of the flange 88 may be turned outwardly and rest on the spacers 21 when the scale is in normal position.

Since the angular movement of the operating arm 50 is multiplied by gears 35 and 33, the line-space raduations are necessarily very close together, and the numbers to indicate the line-spaces corresponding to the graduations would, if written in a line, necessarily be of very small size. Preferably, therefore, in order to avoid too great crowding of lines and numerals, the scale is divided longitudinally by a medial line, and alternate graduations are placed on opposite sides of the latter. Each numeral is then placed at the side of the median line opposite to the corresponding graduation.

lVhen it is desired to use the machine, for example, in typing addresses on envelopes, the machine is set for such work by pressing together the linger-pieces T9 and 80 to release the stop arm 55 which is positioned with the tip of the pointer 86 at the graduation of the scale opposite the numeral indicating the number of line-spaces through which it is desired to advance the envelope to type the first line of the address thereon. The finger-pieces may then be released to permit the teeth 77 on the lever or member 72 to engage with the teeth 78 on the plate 52, thereby securing the stop arm 55 in the proper position. The envelope to be inserted is then placed with its forward edge in contact with the rear feed-rolls 6, which at this stage of the operation serve to gage the envelope in its initial position, and is pressed forward by the left hand of the operator. lVhen the card is in this position, shown in Figure 7, the handle 81 is grasped with the right hand and the arm 50 is swung to its Figure 8 position, thereby positioning the envelope to receive the lirst line of typing. The handle 81 and arm 50 will then be permitted to return to normal or Figure 3 position with the pawl 58 in inefiective position, leaving the platen free to be shifted b other means for typing in other lines. 'I he envelope when addressed may be ejected or removed in any suitable manner and another inserted. In this connection, it will be obvious that the addressed envelope may be removed and another inserted by a single forward movement of the handle 81.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, in combination, a platen, a line-spacing ratchet-wheel having equally-spaced teeth, platen-sweeping mechanism comprising a handle and rotation-multiplying means interposed between said handle and the platen, including multiplying gears, a sweeping ratchet-wheel and an actuating pawl therefor, an overthrow-gear connected to the platen for rotation therewith, and having the same number of teeth as the line-spacing ratchetwheel, and means moved into engagement with the overthrow-gear, between the teeth thereof, by the platen-sweeping mechanism, to arrest the rotation of the platen; the arrangement being such that the overthrowgear will always arrest the platen at exactly a whole number of line-spaces from the point of beginning of the plateirsweeping movement.

2. In a typewriting machine, in combination, a platen, a linespacing ratchet-wheel having equally-spaced teeth, platen-sweeping mechanism comprising nmltiplyinggearing, and an overthrow-gear mounted for rotation with the platen, and having the same number of teeth as the line-spacing ratchetwheel.

A platen-rotating device attachable to one end of the platen-frame of a typewriter and comprising a bracket, a stud projecting therefrom, a spring container comprisinga hub, a coil spring in said container and having its inner end secured thereto, said hub and stud having co-operating portions so that the hub will be held against rotation when placed on the stud, a handle mounted on said stud to turn about the latter and having provisions to permit ready connection thereof with the outer end of said spring, and r0tation-imiltiplying connections between said handle and the platen.

in A platen rotating mechanism comprisng handle, rotation-multiplying means erposed between said handle and said i ten and. including a ratchet-wheel and an actuating pawl therefor, an overthrow gear connected with said ratchet-wheel, and an overthrow pawl to engage said overthrow gear and thereby prevent rotation of the ratchet-wheel, said overthrow pawl being rendered effective by said actuating pawl when the latter approaches the end of its stroke.

Si. platen-rotating attachment adapted to be secured to one end of the platenframe of a typewriter, comprising a bracket on which the other parts of the attachment supported, a driving member journaled in said bracket in alignment with the platen-axle, means to cause said axle to rotate with said driving member, means to effeet a rapid rotation of said driving member comprising a handle urged to its normal position, an adjustable stop to determine such normal position, a pointer on said adjustable stop, and a scale adjacent the stop having a central. line along which the pointer extends and over which the point of said pointer passes, line-space graduations arranged alternately on opposite sides of the central line, and the number corresponding to each graduation placed opposite the same on the other side of the central line.

6. A platen-rotating mechanism compris ing a handle, rotationmultiplying means interposed between said handle and said platen and including a ratchet-wheel and an actuating pawl therefor, an overthrow gear connected with said ratchet-wheel, an over throw pawl to engage said overthrow gear lilU and thereby prevent rotation of the ratchet-wheel, said overthrow pawl being rendered effective by said actuating pawl when the latter approaches the end of its stroke, and an abutment to check the actu ating pawl at the end of its effective stroke.

7. A platen-rotating mechanism comprising a handle, rotation-multiplying means interposed between said handle and said platen and including a ratchet-wheel and an actuating pawl therefor, an overthrow gear connected with said ratchet-wheel, an overthrow pawl to engage said overthrow gear and thereby prevent rotation of the ratchetwheel, said overthrow pawl being rendered effective by said actuating pawl when the latter approaches the end of its stroke, and a device engageable by the actuating pawl atthe end of its effective stroke and effective to force the actuating pawl against the ratchet-wheel to prevent overthrow of the latter.

8. A platen-rotating attachment adapted to be secured to one end of the platen-frame of a typewriter, comprising a bracket on which the other parts of the attachment are supported, a revoluble sleeve of suiiicient internal diameter to receive the end of the platen axle, means to cause said axle to rotate with the sleeve, means to effect a rapid rotation of said sleeve comprising a handle normally urged to rearward position, an adjustable stop to limit said rearward movement, a line-space scale to facilitate the positioning of said stop to determine the number of line-spaces in the movement of the platen due to movement of the handle from its rearward position against the stop to its forward limiting position, a scale-carrying member comprising a plate shaped to fit against the outer surface of the bracket, and co-operating parts on said bracket and plate whereby the plate may be connected with said bracket by move-- ment parallel to itself and then secured in such position to prevent disconnection by movement in the opposite direction.

9. A platen-rotating device comprising an inner plate one end of the platen-frame and an outer plate parallel to the inner plate, means to maintain said plates in proper relative position, comprising spacers, a pivoted actuating lever, a pivoted stop arm, a pointer on said stop arm, a linespace scale with which said pointer cooperates to determine the position of said stop arm for the proper initial position of said lever, so that movement of said lever to its other limiting position will advance the platen the desired number of line-spaces, a scale support comprising a plate portion to lie against the outer surface of said inner plate, and a circular flange projecting from said plate portion and extending beyond the same, the flange portion having its ends so shaped as to engage over the spacers and said plate portion having slots, and screws in said inner plate to enter said slots when the scale support is moved into position and to secure the support in position on said inner plate.

10. A platen-rotating device comprising a bracket attachable to one end of the platenframe of a typewriting machine, a stud projecting from said bracket, rotation-multiplying means t'or said platen comprising a driving gear and a ratchet-wheel for driving the gear, both mounted on said stud, a holding member for said driving gear, and said ratchet-wheel fitting over said stud and secured to said bracket, an operating handle for said ratchet-wheel loosely mounted on said stud at the outer side of said holding member, astop arm for said handle loosely mounted on said stud outside said handle, and means for holding said operating handle and stop arm on said stud, said holding means comprising a nut threaded on the end of the stud and engaging the outer surface of said arm and a screw threaded into the end of said stud and having a head of suiii cient size to engage the outer end of said nut and thereby lock the nut against movement.

11. A platen-rotating device attachable to one end of the platen-frame of a typewriter and comprising a bracket, a stud projecting therefrom, a spring container comprising a hub l'iaving an opening to receive said stud, a coil spring in said container and having its inner end secured thereto, means for holding said container against rotation on said stud, a handle mounted on said stud to turn about the latter and having provisions to permit ready connection thereof with the outer end of said spring, and rotation-multiplying connections between said handle and the platen.

12. A platen-rotating attachment adapted to be secured to one end of the platen-frame of a typewriter, comprising a bracket on which the other parts of the attachment are supported, a plate on the outer side of said bracket and spaced therefrom, a revoluble sleeve journaled in said bracket in position to receive the adjacent end of the platen axle, a stub-shaft journaled in said plate and having its inner end fixed in said sleeve, and a finger-wheel fixed on said stub-shaft outside of said plate.

13. A platen-rotating attachment adapted to be secured to one end of the platen-frame of a typewriter, comprising a bracket on which the other parts of the attachment are supported, a plate on the outer side of said bracket and spaced therefrom, a revoluble sleeve journaled in said plate in position to receive the adjacent end of the platen axle, a stubshaftjournaled in said plate and having its inner end fixed in {said sleeve, a fin ger-wheel fixed on said stub-shaft outside of said plate, a pinion on said sleeve, and means to actuate said pinion.

14. A platen-rotating attachment adapted to be secured to one end of the platen-frame of a typewrier, comprising a bracket on which the other parts of the attachment are supported, a plate on the outer side of said bracket and spaced therefrom, a re-voluble sleeve journaled in said bracket in position to receive the adjacent end of the platen axle, a stub-shaft journaled in said plate and havingits inner end fixed in said sleeve, a finger-wheel. fixed on said stub-shaft outside of said plate, a pinion on said sleeve, a gear meshing with said pinion, a ratchetmember concentric with said gear and fixed hereto, said ratchet member extending between said pinion and the plate and co-opera 'ing with said finger-wheel to hold the stub-shaft against longitudinal movement, and means toactuate the ratchet-member.

15. A platen-rotating attachment adapted to be secured to one end of the platen-frarne of a typewriter, comprising a bracket, a stud projecting therefrom, a gear loosely mounted on said stud, an annulus with ratchet-teet 1 fixed on the outer face of said gear, a spring container comprising a hub and two disks fixed thereon at a suitable distance apart, said hub and stud having cooperating port-ions, so that the hub will be held against rotation when placed on the stud, the container, when in posit-ion 0n the stud, extending into the annulus, a coil spring in said container having its inner end. secured to the container and its outer end projecting therefrom, a fixed plate on the outer side of said container to hold the same in position, a handle mounted on said stud outside of the fixed plate, and a pin on said handle projecting through a slot provided in said plate to engage the projecting end of said spring, so that the latter will urge the handle toward its normal positlon.

16. A platen-rotating device comprising a stud, a ratchet-wheel mounted onsaid stud, a fixed plate fitted over said stud and holding said ratehet-wheel on the stud, a series ofteeth fixed on said plate at its outer face and arranged in an arc of a circle about are axis of the stud, an operating handle loosely mounted on said stud at the outer side of said plate, a pawl on said handle spring pressed to engage said ratchet--wheel, and means to determine the initial position of said handle and to withdraw said pawl to ineffective position when the handle is restored to its initial position, said; determining and'withdrawing means comprising a'stop. arm pivoted on said stud outside of said handle, a member on said stop arm to engage said fixed teeth to holdthestop arm in adjusted position, and an arm fixed to said pawl and arranged to engage said stop arm when the handle is swung to its initial position and swing said pawl out of engagement with the ratchet-wheel.

17. A ilaten-rotating mechanism for a typewriter, comprising, in combination, a member connected with the platen to rotate therewith, means to effect rotation. of said member, con'iprising a pivoted handle nor mally urged to a rearward position, a stop to limit such movement, a stopcarr ving arm mounted to swing about the same axis as said handle, aseries of fixed teeth arranged in the are of a circle about said axis, and a holding member pivotally mounted on said arm and having teeth to engage with said fixed: teeth, and finger-pieces on sand arm and said member, respectively, to shift saith holding member out of engagement with said fixed teeth when pressed together.

18. A platen-rotating mechanism including, in combination, a stop gear. a spur gear connected with the platen to actuate the same, a shaft on. which said gears are sup ported, a driving gear to operate said spur gear, a ratchet-wheel larger than said driving gear and secured thereto on the outer side, a handle, and handle-actuated means including a pawl for rotating the ratchetwheel, a spring-supported arm having a tooth adapted to engage said stop gear, and. a pin on said pawl whereby, at the end of a forward movement of the handle, said tooth will engage said arm and force the tooth thereon into engagement with the stop gear, the pawl being forced against said ratchet-wheel.

A platen-rotating mechanism including, in combination, a stop gear, a sour gear connected with the platen to actuate the same, a shaft on which said gears are supported, a driving gear to operate said spur gear, a ratchet-wheel larger than said driving gear and secured thereto on the outer side, a handle, and handle-actuated means. including a pawl for rotating the atchetwheel, and means wherebi said pawl will be forced against said ratchet-wheel, further movement of the handle being prevented b v engagement of the end of the pawl with the shaft on which the stop gear and spur gear are mounted.

20. In a tvpewritingmachine, in combination, a platen, a platen axle on which said platen is fixed, and platen-aale-rotating means comprisinga stud, gear loosely mounted thereon, a ratchet annulus secured to the outer face ofsaid gear, a front plate engaging the outer face of said annulus to hold said gear on the stud and having a circular opening substantially in register with the opening of the. annulus, a spring container adapted to'enter theopenings in said plate and annulus and having a hub adapted to fit over a portion of the Stud having flats thereon, a spring in said container secured to the hub thereof at its inner end and having a loop at its outer end projecting from the periphery of the container, an outer plate having an opening to receive said stud and fastened to the firstmentioned plate to hold the spring container in posi tion and provided with an arcuate slot, and a lever loosely mounted on said stud outside said outer plate and having a pin projecting through said slot into said loop.

21. In a typewriting machine, in combination, a platen, a platen axle on which said platen is fixed, and platen-axle-rotating means comprising a stud, a gear loosely mounted thereon, a ratchet annulus secured to the outer face of said gear, a front plate engaging the outer face of said annulus to hold said gear on the stud and having a circular opening substantially in register with the opening of the annulus, a spring container adapted to enter the openings in said plate and annulus and having a hub adapted to fit over a portion of the stud having flats thereon, a spring in said container secured to the hub thereof at its inner end and having a loop at its outer end projecting from the periphery of the container, a. circular toothed plate placed over said stud and fixed to the first-mentioned plate to hold the spring container in position, a lever loosely mounted on the stud outside of said toothed plate and having a pin projecting through an arcuate slot in the toothed plate and into said loop, and stroke-adjusting means for said lever comprising a stop arm loosely mounted on said stud, and a member supported on said stop arm to co-operate with the teeth on said toothed plate.

22. In a typewriting machine, in combination, a platen, and a platen-rotating device comprising a fixed stud, an operating arm loosely mounted thereon, a stop arm loosely mounted on said stud outside of said operating arm, means to hold said stop arm in adjusted position, a fixed stop to limit the movement of the operating arm in the opposite direction, and means to secure said arms on said stud comprising a nut threaded on the end of said stud and a screw threaded into the end of said stud and having a head to engage the outer face of said nut.

23. In a platen-rotating device for a typewriting machine, in combination, a stud having flats thereon, a spring container compris:

ing a hub adapted to fit over the flats on said stud, and disks secured to the hub, a coil spring in said container fixed at its inner end to the container and furnished at its outer end with a loop, an operating arm loosely mounted on said stud, and having a pin so positioned thereon that, when the arm is placed on the stud outside the container, the pin may be inserted in the loop, thereby subjecting the arm to the action of the spring urging it to one of its limiting positions, and means to hold said arm on said stud.

24. A platen-rotating device comprising a stud, a ratchet-wheel mounted on said stud, a fixed plate fitted over said stud and holding said ratchet-wheel on the stud, a series of teeth fixed on said plate at its outer face and arranged in an arc of a circle about the axis of the stud, an operating handle loosely mounted on said stud at the outer side of said plate, a pawl on said handle spring pressed to engage said ratchet-wheel, means to determine the initial position of said handle and to withdraw said pawl to inefiective position when the handle is restored to its initial position, said determining and withdrawing means comprising a stop arm pivoted on said stud outside of said handle, a member on said stop arm to engage said fixed teeth to hold the stop arm in adjusted position, and an arm fixed to said pawl and arranged to engage said stop arm when the handle is swung to its initial position and swing said pawl out of engagement with. the ratchet-wheel, and means for holding said operating handle and stop arm on said stud, said holding means comprising a nut threaded on the end of said stud and a screw threaded into the end of said stud and having a head to engage the outer face of said nut.

25. In a typewriting machine, in combination, a platen, a line-space lever for operating said ratchet-wheel, platen-sweeping mechanism comprising multiplying gearing and an actuating ratchet-wheel, and an overthrow-gear mounted for rotation with the platen, and having the same number of teeth as the ratchet-wheel.

ALFRED G. F. KUROWSKI.

Witnesses:

CATHERINE A. NEWELL, JENNJIE D. THORN'E. 

